is there a particular PWM valve you have in mind that would be well-suited for meth/water injection applications?

 

There are a great deal of solenoid valves out there. The faster the response time the better. Most common valve's response time is between 5-10ms. If is posible to over driving it by pumping more current into it (12V into a 5V coil) to improve the opening time. But shut-off time will still be the same. You will suffer from higher temperature rise.

Alternatively, you put in a stronger return spring to improve shut-off time. But you will need more a powerful coil to open it. Heat and valve seal wear will be a priming concern. Example: Do not use a nitrous valve for water injection purpose, it often draws 12A! to open.

The HSV we use is not perfect but it is a good performer all round. Unfortunately, it is just too expensive for this project.

 

I'm still researching the fuel injectors designed for alcohol use. I guess in Brazil all the cars are designed to run 100% Ethanol so SOMEONE out there makes injectors designed for it

MSD's injectors are supposed to be alcohol safe but they still recommend purging the system with gas to preserve the life of the o-rings. I personally can change out my o-rings on occasion. Their new injectors are roughly $50 each.

Anyone know the best o-rings to use for alcohol? I assume VITON seals can handle alcohol no problem but I dont know if they sell a variety of sizes for fuel injectors.

 

search for "chemical compatibility" chart for rubber. Wrong place for specialist subject.

 

Well, these injectors are compatible with methanol, but to what extent, I don't know. I'm curious to see how well they'd hold up to 50/50 meth and water.

 

Those are too small for my setup. I need between 500cc-670cc's roughly. My main concern is 100% alcohol, water use is a less concern in my setup right now. I assume that if the injector can handle the abuse of methanol in long term use, it can handle water too.

 

those flow rates were measured at 44 psi. I'm not sure how much pressure the walbro generates, but the shurflo pump will definitely exceed that.

 

Read this thread man, I'm using a 1:1 adjustable FPR so I have control over the fuel pressure at all times. I can have it set for a static pressure between 40-70psi and it increases expodentially with boost pressure. The walbro can offer enough fuel flow over 120psi, which is far more than I need. My system is far more controllable than a shurflo system which needs multiple control devices.

Crazy fuel pressures aren't necessary with fuel injectors, they have great atomization at lower fuel pressures than the standard alky kit nozzles, one reason I am pursuing this concept.

 

Sorry, I guess I really don't understand how your kit works as well as I thought I did. At the very least I thought that the 427cc injector would flow in the 500s at what I thought was your max pressure (75 psi), which would fulfill your needs. But I think I'm just confusing myself, so I'll stop bugging you. Good luck with your kit.

 

Its no problem, I invite the interest from anyone. My target CC size is 640cc's for my application which would increase my ethanol mix from 10%(comes that way straight out of the gas pumps in my area) to 30%. This will help reduce my IDC's by 22% and increase my AKI octane rating from 93 to 98.

 

Well, got a BUNCH of failsafes able to be implemented and controlled by the ECU now and I can increase the octane level of 93 octane to 100 octane with the latest setup (basically a 40% eth/meth to 60% gasoline mix). It now runs up to 1100cc's of fuel flow (would be much less with the average injector dudty cycles people will be seeing) and the fuel injector can safely run ethanol/methanol for the duration of the injectors useable lifespan A few more loose ends and I will have to start a new thread,lol.

P.S. Tephra rocks. I just had to add that

 

so you got a mixture of alcohol/gas injected before the throttle plate?

do you have a pic of your setup?

 

Its 100% denatured alcohol (its a 50/50 mix of ethanol and methanol) and the injector mounting bung will be welded to the intake pipe just before the throttle body (before the factory rubber elbow section). No pics yet, I am looking for a local guy to help with some testing of the setup (RI/MASS/CT). I basically designed the control unit for the system, I just found the best products to use to go along with it which need to be purchased seperately. Once the testing and tweaking are done, I'll pre-assemble the entire kit.

 

denatured alcohol is mostly ethyl alcohol + several % methyl alcohol as a poisoning agent (some might add other stuff)...

 

Actually...if you look at the MSDS sheet for the denatured alcohol by KLEAN STRIP (the stuff at Home Depot) its 45-50% Ethanol and 45-50% Methanol Another example of people getting half information via forums lol. I thought the same until I researched products in depth. Who knew?lol

Here is the link, if I'm incorrect here..I have thick skin. I can take it haha

http://www.wmbarr.com/ProductFiles/rCSL26.pdf